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Journal Article

Photoinduced processes on alkali covered surfaces: NO desorption from KCr2O3(0001)

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Wilde,  Markus
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Beauport,  Ingrid
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Al-Shamery,  Katharina
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Wilde, M., Beauport, I., Al-Shamery, K., & Freund, H.-J. (1997). Photoinduced processes on alkali covered surfaces: NO desorption from KCr2O3(0001). Surface Science, 390(1-3), 186-193. doi:10.1016/S0039-6028(97)00547-5.


Cite as: https://hdl.handle.net/21.11116/0000-0008-CB96-A
Abstract
We have studied the ultraviolet laser induced desorption of NO/Cr203(0001), K/Cr203(0001 ), and the coadsorbate system NO/K/Cr2O3(0001) using resonance enhanced multiphoton ionization spectroscopy for state selective detection of the desorbing species after excitation with nanosecond laser pulses. The goal of our experiments was to study the influence of surface electronic modifications via alkali adsorption on the photodynamics of a simple molecule. The photochemistry of the isolated and the coadsorbate systems is strongly dependent on the coverage of the diverse components. In this paper we shall mainly focus on data for the low coverage regime of potassium. From the two adsorbate species of NO, a chemisorbed and a physisorbed species, we present data of the chemisorbed species. The velocity distributions show a strong dependence on the excitation energy which we interpret on the basis of electron energy loss spectra as being due to surface charge transfer states. This is corroborated with our coadsorption experiments with low coverages of potassium which alter the velocity distributions.